Adds support for parsing varint length delimited input data

[childen]

Add support for parsing varint length delimited input as used by the parseDelimited and writeDelimited functions in java

[codecov[bot]]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (1dcad14) 69.54% compared to head (69d864d) 61.96%.

Files	Patch %	Lines
src/ProtobufDisplay.js	0.00%	16 Missing and 2 partials :warning:
src/protobufDecoder.js	38.46%	8 Missing :warning:
src/App.js	33.33%	2 Missing :warning:
src/ProtobufPart.js	0.00%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
- Coverage   69.54%   61.96%   -7.59%     
==========================================
  Files           8        8              
  Lines         220      255      +35     
  Branches       39       46       +7     
==========================================
+ Hits          153      158       +5     
- Misses         62       90      +28     
- Partials        5        7       +2     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[pawitp]

• Please make sure the build passes (see Netlify status checks)
• Would it be possible to automatically detect such messages (e.g. by checking if the message length matches the prefixed length though out the message)?
• Please provide example data so I can verify the functionality
• Please write unit tests where existing code has unit tests